ok, im orderin my megan cat-back.. all it says is that some are 2.5 and some are 3" can some one please tell me which one it is??? I need to know now because im gettin the zzp header/dp http://www.zzperformance.com/cobalt_...=540&catid=155 and need to know what all the options i need are? If anyone can help me out here i'd appreciate it.. thanks in advanced!

anyone?

 

The Megan is 2.5". So you'll wanna order the ZZP downpipe in 2.5" as well for optimal results.